Hi, Tom1807
You said jcv did not work.
You mean your device can detect jcv file ( but can not display ), or your device can not detect the jcv file ??
For me (GarminAsusM10) , M10 can detect jcv but can not display.

Sorry, u are wrong in this case, I can flash my machine to SG/MAL FW, and JCV should be displayed. But without the right filename, it can't be detected by the Nuvi.
Similar like Thai JCV, it can be used but would show "Pirated Copy" if its not on SG/MAL FW

The JCV is encrypted, I think it only works on units bought in Indonesia (they might have some particular unique HWIDs). I personally have an American model 260W flashed to 2W Mal/SG firmware and the same problem happens. Lane assist & Highway mode works though.

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